Year	Percent
1950	3.99978
1955	3.72438
1960	3.82615
1965	4.00188
1970	4.27382
1975	4.32689
1980	4.13859
1985	3.96354
1990	4.09405
1995	4.25856
2000	4.47015
2005	4.77191
2010	5.73354
2015	6.45064
2020	7.30449
2025	8.16587
2030	9.03017
2035	9.76241
2040	10.51118
2045	11.21772
2050	12.10961
2055	13.3769
2060	14.70335
2065	15.93348
2070	17.11373
2075	18.37253
2080	19.66816
2085	20.96714
2090	22.26741
2095	23.5628
2100	24.83368